void keyPressed(){
  
  switch( key )  {
    
    case '1':
      fAnimateMode1Ratio1 = .0f;
      fAnimateMode1Ratio2 = .0f;
      nTimeStart = millis();
      displayMode = 1;
      break;
      
    case '2':
      fAnimateMode2Ratio1 = .0f;
      fAnimateMode2Ratio2 = .0f;
      nTimeStart = millis();
      displayMode = 2;
      break;
      
    case '3':
      nTimeStart = millis();
      displayMode = 3;
      break;
      
    case '4':
      displayMode = 4;
      break;
      
    default:
      break;
      
  }
}